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ANALYZING THE GROWTH PATTERNS OF STERLET (ACIPENSER RUTHENUS) VS. HYBRID STURGEON (A. RUTHENUS, FEMALE X A. GUELDENSTAEDTII, MALE) FINGERLINGS REARED WITHIN A RECIRCULATING AQUACULTURE SYSTEM
Abstract
Reusing and recirculating the water in which aquatic organisms are cultivated is a crucial goal in improving the sustainability of aquaculture. As a result, recirculating aquaculture systems (RAS) have become increasingly popular recently as a means of raising various fish species, including sturgeons. Sterlet (Acipenser ruthenus) and a sturgeon hybrid (a cross between male A. gueldenstaedtii and female A. ruthenus) were reared in a RAS, and their growth was monitored during the first 6 months of their life. The aim was to analyze the growth patterns of their main body traits while maintaining identical rearing conditions. The RAS used for our trials had 3 tanks with a volume of one cubic meter each. Three hundred sterlets and 300 sturgeon hybrids, each 2 months old, were placed in triplicate into the three tanks of the RAS, with each tank containing a combination of 200 fish (100 sterlets and 100 hybrids, respectively). Thirty sterlets and 30 hybrids were randomly measured twice per month to determine key body traits, including total length, standard length, maximum body depth, and body weight. At 2 months old, the disparities in primary body traits between sterlets and hybrid sturgeon were minimal and statistically insignificant (p>0.05). However, by the time they reached 6 months of age, these differences had increased highly significant (p?0.001). The hybrid sturgeons significantly outperformed the sterlet in the same RAS rearing conditions, being much heavier and longer at the age of 6 months.
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